// Copyright 2018-2019 The logrange Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package utils

import (
	"os"
	"os/signal"
	"syscall"
)

type (
	SignalCallbackFn func(s os.Signal)
)

func NewNotifierOnIntTermSignal(callback SignalCallbackFn) {
	if callback != nil {
		go func() {
			sigChan := make(chan os.Signal, 1)
			defer signal.Stop(sigChan)

			signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
			select {
			case s := <-sigChan:
				callback(s)
			}
		}()
	}
}
